I had trouble on two voice boards to go up to 8.4Vpp for HPF resonance, so I decided to take the value from the CS-60 manual and go for the 7.6Vpp as instructed there. Not sure what the right value for a CS-80 is or where it starts to sound wrong.
Also instruction for the 2.2Vpp for LPF cutoff does not seem right. If I want to go for 2.2Vpp I have to dial the trimpot almost full to the end. The original value gave me a reading of 1.4-1.6Vpp, so I did the same as JM and used 1.6Vpp.
I wonder about the other guys who work on CS-80s how you handle this part or what your findings are?